I often find it hard to accept my own handwriting when it comes to expressing sets (for instance, the set of real numbers, $\mathbb R$), and vectors (for instance, the vector $v=(v_1,v_2)^T$). I've seen $\mathbb R$ written something similar to IR, and $v$ with another line on either of its wings, but can someone list all of them so I can follow the example of them?
i.e if someone can write all 26 down each for capital and small case letters on a piece of paper, then take a picture of it, then upload it here, then that would be the best. Thanks!
Here is my best guess on handwritten blackboard bold capitals:
Note that I have written some of them for the first time right now, because they are rarely used in mathematics at all, like $\mathbb{S,U,X,Y}$, where I just guessed.
Blackboard bold lowercase letters don't exist as far as I know. For vectors we usually write $\mathbf a$, $\vec{a}$ or just $a$ in typesetting and stick to one of the two last variants in handwriting.